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To: cs551@merlot.usc.edu
Subject: Re: About "drop probability"
Date: Tue, 23 Sep 2008 23:08:43 -0700
From: Bill Cheng <william@bourbon.usc.edu>

SOmeone wrote:

  > I have a question about what exactly "customer drop probability" is when 
  > Ctrl+C is pressed.
  > 
  > e.g., mm2 -n 10, there will be 10 people totally.
  > At one moment, 5 people've arrived: c1 is served at s1; c2 is served at 
  > s2; c3, c4, c5 is in the queue, then Ctrl+C is received.
  > 
  > In this situation what's customer drop probability?
  > Is it 3/5? (5 arrived, 3 dropped)
  > or 8/10? (10 people, 8 dropped)
  > Both sounds reasonable.

It's actually zero!  Again, you have to report what you have
measured.  In your measurement, none of the customers that
you have generated has been dropped!  So, the drop probability
(number dropped divided by number generated) is zero.
--
Bill Cheng // bill.cheng@usc.edu <URL:http://merlot.usc.edu/william/usc/>